#!/usr/bin/python3
# -*- coding: UTF-8 -*-
__Author__ = "Alvin Liu"


import pygame


class Ship():
    def __init__(self, screen):
        """初始化飞船的位置"""
        self.screen = screen
        
        # 加载飞船图像并获取器外界矩形
        self.image = pygame.image.load('images/ship.png')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom
        
        # 移动标志
        self.moving_right = False
        self.moving_left = False
        
        
    def update(self):
        """根据移动标志调整飞船的位置"""
        if self.moving_right:
            self.rect.centerx += 1
        elif self.moving_left:
            self.rect.centerx -= 1
            
        
        
    def blitme(self):
        self.screen.blit(self.image, self.rect)
